Roller mill



Nov. 10, 1931. K. WIEMER 1,831,696

v ROLLER MILL Filed Nov. 26, 19 29 2 Sheets-Sheet 1 Fig.4

Nov. 10, 1931. WIEMER 1,831,696

ROLLER HILL Filed Nov. 26, 1929 2 Shoots-Sheet 2 4 meme,

I Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE KURT WIEMER, OF DRESDEN, GERMANY, ASSIGNOR T FIRM J. M. MA- SCHINENFABRIK, 0F DRESDEN, GERMANY ROLLER MILL Application. filed November 26, 1929,Serial No. 409,912, and in Germany November 27, 1928.

This invention relates to a roller mill of known type, with a series of rolls traversed in succession by the material under treatment, the rolls revolving at different speeds, increasing from roll to roll, and the material under treatment being sup-plied to the gap between the first and second rolls, and the finished material being removed from the last roll by means of a scraper.

The object of the invention is to construct such a machine in such a way that the material, when once delivered to it, passes in a continuous operation without further manipulation through the series of rolls two or even more times before it is withdrawn from treatment by the aforementioned scraper.

For this purpose the total working breadth of the machine, which corresponds to the length of the rolls, is soto speak divided into two or more parts, without the rollers themselves needing to be divided into such parts.

Assuming that the material is to pass twice through the series of rolls, it is supplied to the first roll opening only along half the 8 working breadth, so that the material runs through the series of rolls only in this first half of the working breadth. It is then scraped off the last roll, but not removed from the machine, being supplied by suitable means to the second half of the working breadth, where it-enters the first roll opening again. Only after it has traversed the second half of the working breadth is it removed. from the last roll by a scraper controlling this second half and withdrawn from treatment. In a similar manner, however, the material may traverse the series of rolls three timesor even often'er.

' The transverse'feeding of the half finished material brings about a thorough mixing of the particles treated in one part of the working breadth. The machine even permits of satisfactorily mixing the materials delivered to it separately, and initially passing then singly through the series of rolls. such as soap pastes of different colours. if for example, with the working breadth divided into three parts, instead of one primary delivery or feed point, two such points are arranged adjacent to the ends of the rolls, and the two masses,

after each has passed once through-the series of rolls alone, are brought by the transverse feeding means into the central section of the working breadth and supplied again to the first roll opening, to be mixed together during their second passage through the machine.

In any case, from the introduction of the material until it leaves the machine in a finished condition no manipulation is necessary.

While at the admission point fresh material is supplied from time to time either by hand or continuously by mechanical means, at the discharge point finished material leaves the machine continuously. Since the parts of the material, which travel side by side through the series of rolls during theirfirst passage, are pressed into one another, after being transferred to the second section of the working breadth and then treated afresh therein,

a thorough mixing of the materials is ob- 7o tained.

The invention is illustrated b way of example iri the accompanying rawings, in which Figures 1, 2 and 3 are front elevations of machines according to the invention,

Figure 4 is a sectional elevation on the line A-B in Figure 1, but also applies substantially to Figs. 2 and 3 as well, v

Figure 5 is a perspective view of a mag chine, which corresponds as regards the subdivision of the working breadth to Fig. 1, but in which other means are employed for shifting the material transversely after its first passage through the machine.

In all these constructional-forms the mavchaine has four rolls 1, 2, 3 and 4, which are journalled in a known manner in cheeks or end frames 5. A counter-shaft 3a serves as a driving shaft. It carries a belt pulley 6,'and drives the roll 3, by means of toothed wheels 6a and 7, and drives the roll 4 by means of the toothed wheels 6a and 7 and another toothed wheel 8. By the shaft-carrying the toothed wheel 7 the roll 2 is driven through toothed wheels Sand 10, from which again, through toothed wheels 11 and 12, the roll 1 is set in operation.

The toothed wheels are so dimensioned that with rolls of the same diameter their speeds of revolution, and therefore also their peripheral velocities, increase continuously from the roll 1.

Now by a transverse plane, indicated by the line C-D in Figs. 1, 2 and 3, the machine is divided for working purposes into two halves, though the rolls themselves may be unitary and smooth. In front of the rolls 1 and 2 is located a charging trou h or hopper in front of the last roll 4, a scraper 14 is arranged. This allows the material scraped off to drop into a chute 15, which transfers it to the right-hand half of the working breadth and lets it drop into the part 13 of the trough 13. Thus the material passes a second time into the roll opening between the rolls 1 and 2, but now in the right-hand half of the working breadth, so that it traverses the series of rolls again. On the last roll 4, however, in the right-hand half of the working region, there is no scraperlike 14, but here there is a scraper 16 fitted to the roll 4, and this scraper withdraws the now finished material from the operation of the machine, and lets it fall by way of a chute 17 for example, into a box to be placed behind the machine.

The constructional form illustrated in Fig.

'2 does not need much further description.

The lines CD and C- indicate a di-' parts on the lines CD and CD", but in this case' the central part is of the same breadth as the two outer parts put together. The trough 13 is similarly divided. Its two outer portions are denoted by 13", since fresh, that is to say, untreated materialis placed in both, While the central part is marked 1.3

and provides for a second passage of the material through the machine. In the case of thisconstructional form, two quantities of material, differing in colour or otherwise, are to pass separately through the series of rolls at the same time, and are then to be united in the central portion of the working breadth to be mixed together once more. Accordingly there corresponds to the tWo outer parts of the working breadth two scrapers 14' and two chutes 15, which both guide the material into the central section 13 of the trough. After the total quantity of material here united has traversed the series of rolls, it is withdrawn from the portion of the machine by the scraper 16, which in this case controls the central section of the working breadth.

The machine illustrated in Figure 5 corresponds, as already stated, to the constructional form shown in Figures 1 and 2, but here, instead of the chute 15, a belt conveyor 18 is arranged transversely in front of the r0114, this belt conveyor passing over rollers 19 and 20, and transfers the material taken up by the stripper 14 to the right-hand half of the working breadth, and allows it to drop into the half trough 13 The left-hand roller of the belt conveyor is driven by the shaft of the roll 4 through toothed wheels.

Other means may also be employed for conveying the material from one section of the working breadth to another, as the invention is in no sense limited to the particular constructions here described and illustrated.

What I claim is 1. A roller mill comprising'a series of rolls moving from the last roll the material that has passed through the mill, means for transferring the partially treated material removed from the last roll to another portion of the working breadth of the mill, means for supplying the material so transferred to the first roll opening for another passage through the mill in this other portion of the working breadth, and means for removing from the last roll the material that has again passed through the mill and withdrawing it from the mill.

, 2. A roller mill comprising a series or roll openings adapted to be traversed in succession by material undergoing treatment in the mill, means for positively rotating the rolls at different peripheral speeds, the speeds being successively greater in the order in which the rolls act upon the material under treatment, means for supplying untreated material to the first roll over parts only of the Working breadth of the mill, means for removing from the last roll the material that has passed through the mill, means for transferring the partially treated material removed from the last roll to another portion Tl of the working breadth of the mill, means for supplying the materialso transferred to the first roll opening for another passage through the mill in this other portionof the working breadth, and means for removing from the last roll the material that has again passed through the mill and withdrawing it from the mill.

3. .A roller mill comprising a series of rolls so mounted as to form a ser es of roll vopenings adapted to be traversed in succession by material undergoing treatment in the mill, means for positively rotating the rolls at different peripheral speeds, the speeds being we cessively greater in the order in which the rolls act upon the material undertreatment, means for supplying untreated material to the first roll over two parts only of the working breadth of the mill simultaneously, these parts being situated at the extremities of the working breadth, means for removing from the last roll the material that has, passed through the mill. means for transferrin the partially treated material removed from both the end portions of the last roll to the intervening portion of the working breadth of the mill, means for su plying the material so transferred to the roll opening for another passage through the mill in thls intervening portion of the working breadth, and means for removing from the last roll the material that has again passed through the mill and withdrawing it from the mill.

4:. A roller mill comprisin a series of rolls a so mounted as to form a series of roll openings adapted to be traversed in succemion by material undergoing treatment 1n the means for positively rotating the rolls at dif:

ferent peripheral speeds, e speeds being succemively greater in the order in which the rolls act upon the materiallmder treatment,

the first roll over two parts only of the working breadth of the mill simultaneously, these parts being situated at the extremities of the working breadth, means for removing from the last roll the material that has passed from the last roll the material In testimony whereof I have signed my I name to this specification. KURT means for supplying untreated material to the first roll openin over a part only of the working breadth of the mill, means for removing fromthe last roll the material that has passed through the mill, an inclined chute a for transferring the artially treated material removed from t e last roll to another portion of the worhng breadth of the mill, means for sup lying the material so transferred to the rst roll opening for another passage through the mill in this other portion of the working breadth and means for removing from the last roll the material that has again passed through the mill and with drawing it from the mill.

5. A roller mill comprising a series of rolls so mounted as to form a series of roll openings adapted to be traversed in succession by material undergoing treatment in the mill, means for positively rotatin the rolls at different peripheral speeds, @e speeds being successively greater in the order in which the rolls act upon the material under treatment, means for supplying untreated material to 

